Abstract

Paralleling of three-phase voltage-source inverters (VSIs) is recommended to allow using low power rating VSI modules in high power applications. This paper presents the operation of two-module three-phase two-level VSIs using a selective harmonic elimination pulse width modulation (SHE-PWM) approach to reducing the output voltage harmonics. Unlike the standard PWM approach, a different switching pattern for each VSI module is proposed to eliminate more harmonics from the output voltage. Moreover, genetic algorithm (GA) optimization technique is used offline to determine the optimum switching angles by solving the nonlinear transcendental equation set. Simulation results show how more output voltage harmonics can be eliminated with the proposed SHE-PWM approach than with the standard approach. Both the mathematical formulations used to generate suitable PWM patterns and simulation results are presented in this paper.

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